# Refractive index of glass with respect to water is $1.125$ . If the absolute refractive index of glass is $1.5$ find the absolute refractive index of water.

$(a)\;1.23 \\ (b)\;1.5 \\ (c)\;1.33 \\ (d)\;1.77$

Here refractive index of glass with respect to water
$\qquad= 1.125$ and absolute refractive index of glass $\mu_g=1.5$
We know that $a \mu_w=\large\frac{a \mu _g}{w _\mu g}=\frac {1.5}{1.125}$
$\qquad=1.33$
Hence c is the correct answer.